Dan B
Member
I apologize if this has been a topic before, but I searched and I did not find a topic about this yet.
Brief history: I have a 07 Sport Trac, 4.0, 2WD, got it with 50K on it 4 years ago. Now I'm over 100K, and I have not done any maintenance to the transmission (5R55S). I do not tow, nor do I abuse my vehicle - that is what my car is for. I have done hours of research on these transmissions and know their issues. But the issue I am having does not seem to match any of the known problems out there...
The issue: Lately I've developed a noticeable bump or thump on upshifts or downshifts-all gears. It will not do it when accelerating steadily or hard but if I'm accelerating and a car slows down in front of me - I let off the gas and it will thump upon shifting up. When coming to a stop I can hear it thump into first when I'm coasting slow. I do not have any issues with OD, no other shifting issues aside from this noise. I do sometimes have a slight hesitation when I'm coasting to a light to take a turn, and when I hit the gas it seems like it hesitates before 1st takes off (TPS maybe?) but does not do this all the time.
I was planning on testing the solenoid pack but I question that effort as if it was the cause - I'd have more than just a thump issue. I am definitely planning on a drain/refill, filter change and band adjustment this weekend. Years ago I did check fluid level and topped it off because I had to change my radiator - was fine after that though. Case bore/piston issue - I'd have loss of gears correct? I don't even know - the bores could have already been fixed prior to my ownership. Some people said "grease the splines" but the only splines I see are the transmission end of the drive shaft and I don't want to contaminate anything in the transmission. I also did disconnected the battery for a while to clear any programmed things.
I have no problem taking the transmission out and rebuilding it if it comes to that - I've done many rebuilds before and lots of mechanical work but this one has got me clueless, and I don't want to spend time & money guessing.
Any suggestions? Would a shift kit help/? Anyone experience this before? Thanks in advance for any help.
Brief history: I have a 07 Sport Trac, 4.0, 2WD, got it with 50K on it 4 years ago. Now I'm over 100K, and I have not done any maintenance to the transmission (5R55S). I do not tow, nor do I abuse my vehicle - that is what my car is for. I have done hours of research on these transmissions and know their issues. But the issue I am having does not seem to match any of the known problems out there...
The issue: Lately I've developed a noticeable bump or thump on upshifts or downshifts-all gears. It will not do it when accelerating steadily or hard but if I'm accelerating and a car slows down in front of me - I let off the gas and it will thump upon shifting up. When coming to a stop I can hear it thump into first when I'm coasting slow. I do not have any issues with OD, no other shifting issues aside from this noise. I do sometimes have a slight hesitation when I'm coasting to a light to take a turn, and when I hit the gas it seems like it hesitates before 1st takes off (TPS maybe?) but does not do this all the time.
I was planning on testing the solenoid pack but I question that effort as if it was the cause - I'd have more than just a thump issue. I am definitely planning on a drain/refill, filter change and band adjustment this weekend. Years ago I did check fluid level and topped it off because I had to change my radiator - was fine after that though. Case bore/piston issue - I'd have loss of gears correct? I don't even know - the bores could have already been fixed prior to my ownership. Some people said "grease the splines" but the only splines I see are the transmission end of the drive shaft and I don't want to contaminate anything in the transmission. I also did disconnected the battery for a while to clear any programmed things.
I have no problem taking the transmission out and rebuilding it if it comes to that - I've done many rebuilds before and lots of mechanical work but this one has got me clueless, and I don't want to spend time & money guessing.
Any suggestions? Would a shift kit help/? Anyone experience this before? Thanks in advance for any help.